Edge (also known as Edgy or Edge by Mobigame) is a puzzle game developed by Mobigame for the iOS devices. Originally released on the iTunes App Store in December 2008, it has been removed and re-added to the store multiple times due to a trademark dispute with Tim Langdell of Edge Games, concerning the use of the word "Edge" in the title.[1] The game was released on PlayStation Minis in Europe and Australia on December 2, 2010 and September 20, 2011 in North America.[2] The game was released on Steam on August 11, 2011 and on Android along with Edge Extended on January 31, 2012, as part of the first Android Humble Indie Bundle, followed by a release on Wii U on November 21, 2013. Edge was also released for the Nintendo 3DS on December 26, 2013.

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The gameplay involves guiding a cube around 48 levels (the three last levels have to be unlocked by taking all the prisms in the 45 previous levels) collecting coloured prisms by dragging the finger across a touch screen (or using analogue controls on PC and Wii U), taking care not to fall off the paths. By dragging hard enough, the player can make the cube climb over steps. By balancing the cube along the edge of a wall or space, players can hang across certain edges in order to cross large gaps. In addition to dragging, the game can be controlled by on-screen keys or the iPhone's tilt-sensing accellerometer. Certain areas will cause the cube to shrink, allowing it to fit into smaller gaps and climb up walls. Collecting all prisms in a level and clearing it quickly earns players an S rank.

On May, 2009, the game was removed from the App Store concerning a trademark dispute with Tim Langdell of Edge Games. This is one of several disputes Langdell had made over his apparent ownership of the trademark for the word 'edge'. Mobigame head David Papazian failed to come up with any negotiation with Langdell, who kept insisting on receiving revenue from the game while it was on sale.[3] Mobigame's lawyers disputed that Langdell's trademarks over the word 'edge' were enforceable against them, a comment to which Langdell denied in an open letter.[4] This rebuttal was deemed false by Mobigame's lawyers, who said they are gathering evidence to demonstrate that communications Edge Games claims, in its rebuttal, to have made did not actually occur.[5]

While no agreement or settlement was made between Mobigame and Langdell, on October 7, 2009, the game was placed back onto the App Store, under the title Edge by Mobigame, which was approved by Apple. Speaking with Kotaku, Papazian said, "on the legal side, (Langdell) cannot claim anything against "Edge by Mobigame" and Apple knows that, so we hope everything will be alright now." However, on November 26, 2009 it was removed again.[6] An unnamed EDGE Games representative stated "Adding 'by Mobigame' was determined not to get around infringement." [7] On December 1, 2009, the game returned to the App Store under the name Edgy,[8] but Mobigame soon removed it for fear that Langdell would use the legal precedent in his legal battle against EA.[9] As of January 8, 2010, the game was available only in countries other than the US and UK under the name 'EDGE.' On May 9, 2010, the game returned to the US iTunes Store under the original name.[10]

The game has been met with positive feedback with an average score of 85% on iPhone review websites.[11] It received the Milthon Award for Best Mobile Game at The Paris Game Festival, as well as winning the "Excellence in Gameplay" category at the International Mobile Gaming Awards. It was a triple finalist at the Independent Games Festival and has been ranked as one of Apple's 30 "Favorite Games" on the App Store's first birthday.[12]